Sounds like the MKI nav computer is either missing, disconnected, or broken. The TV module actually runs the whole system with the MKI-era stuff. You could try to find a used MKI computer, or take advantage of the opportunity to upgrade to a flashier MKIII or MKIV.

__________________
SOLD
2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input